Ayahuasca Effects

Ayahuasca is a very traditional Tea drunk in Amazonian forests since 4000 years ago. It can improve our conscience by contacting the superior truth. In Peru and Brazil its considered National Cultural Patrimony and not a drug. I have used it sometimes and It changed my life style. I used to go to Phiquiatrysts when I thought I was suffering from Bipolar disorder. Others said I was depressed. But after taking the Tea I never felt sick again. How do Science explains that?
I think theconvergency between subjective experience and objectivity interviews will never be undestood, but if objectivistic science treatment is not working, why not try to find a way with a very personal subjective experience, to release us from our bad dreams?